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Full text of "The Morphology And Evolution Of The Apes And Man"

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THE   MUSCULAR  SYSTEM                  1W
Gluteus Maximus.—The origin extends fruin th-posterior part of the iliac crest along the sacrum, COCCVM, great sacro-sciatie ligament and ischial tubercsity ; but the attachment to the crest is by fascia in the Chiiu-panzee. In the Gorilla and Chimpanzee the :n>erti-n reaches the external femoral condvle, and it mav rise
f.                                                                                       4.
with the short head of the bleeps ; in the Orang it reaches the middle of the femur; in the (-ribbon the insertion is restricted to the upper part of the femur. The muscle is segmented in the Orang, but in other Apes the various parts are fused, Hepburn >83^ pointed out that the parr arising from the tuber ischii i> the displaced agitator cauda?.
The glutens medius is very similar in all the Apes, and it is more powerful than the last muscle. It arisen from the whole dorsum ilii down to a line from the sciatic notch to the anterior inferior spine. It also arises by an aponeurosis from the anterior border of the ilium. It is inserted into the outer aspect of the great trochaater, and it may be connected to the pyriformis. The tendon is split by the vastus externus in the Chimpanzee. It is separated from the scansorius and pyriformis by bursiv (fig. 36, D).
The gluteus minimus is larger in the Gorilla and Chimpanzee than in the Orang and Gibbon: and it may be divisible into two parts, as in the Gorilla, or into three as in some Chimpanzees. It is inserted into the upper border of the great trochanter. In the Chimpanzee and Orang it gives off a muscular sheet—the musculus scansorius—which is inserted into the upper border of the great trochanter of the femur in close
relation to the gluteus medius, pyriformis and vastus 13